Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors

Abstract

A common path to superconducting spintronics, Majorana fermions, and topologically-protected quantum computing relies on spin-triplet superconductivity. While naturally occurring spin-triplet pairing is elusive and even common spin-triplet candidates, such as Sr${}_2$RuO${}_4$, support alternative explanations, proximity effects in heterostructures can overcome these limitations. It is expected that robust spin-triplet superconductivity in magnetic junctions should rely on highly spin-polarized magnets or complex magnetic multilayers. Instead, we predict that the interplay of interfacial spin-orbit coupling and the barrier strength in simple magnetic junctions, with only a small spin polarization and s-wave superconductors, can lead to nearly complete spin-triplet superconducting proximity effects. This peculiar behavior arises from an effective perfect transparency: interfacial spin-orbit coupling counteracts the native potential barrier for states of a given spin and wave vector. We show that the enhanced spin-triplet regime is characterized by a huge increase in conductance magnetoanisotropy, orders of magnitude larger than in the normal state.

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Cited by in corpus (21)

• Cubic spin-orbit coupling and anomalous Josephson effect in planar junctions
• Supercurrent Diode Effect, Spin Torques, and Robust Zero-Energy Peak in Planar Half-Metallic Trilayers
• Critical supercurrent and ${\varphi }_0$ state for probing a persistent spin helix
• Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction
• Electrical and Thermal Transport in Antiferromagnet-Superconductor Junctions
• Tunable planar Josephson junctions driven by time-dependent spin-orbit coupling
• Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions
• Superconductivity-enhanced spin pumping: Role of Andreev resonances
• Planar Josephson Hall effect in topological Josephson junctions
• Unconventional Josephson supercurrent diode effect induced by chiral spin-orbit coupling
• Supergap and subgap enhanced currents in asymmetric {S_1FS_2} Josephson junctions
• Resonant Tunneling Anisotropic Magnetoresistance Induced by Magnetic Proximity
• Signatures of enhanced spin-triplet superconductivity induced by interfacial properties
• Signatures of a Spin-Active Interface and Locally Enhanced Zeeman field in a Superconductor-Chiral Material Heterostructure
• Transport Signatures of Radial Rashba Spin-Orbit Coupling at Ferromagnet/Superconductor Interfaces
• Upper critical fields in normal metal-superconductor-normal metal trilayers
• Evidence for anisotropic spin-triplet Andreev reflection at the 2D van der Waals ferromagnet/superconductor interface
• Giant shot noise in superconductor/ferromagnet junctions with orbital-symmetry-controlled spin-orbit coupling
• Rashba spin-orbit coupling enhanced magnetoresistance in junctions with one ferromagnet
• Perspectives on Magnetic/Superconductor Hybrid Systems: Long-range Electromagnetic Phenomena Induced by Proximity Effect and Interfacial Spin-orbit Coupling
• Influence of Magnetic Order on Proximity-Induced Superconductivity in Mn Layers on Nb(110) from First Principles